I`d like to earn money by using promoted tweets. One of my Twitter accounts has 9000+follower . Most of the followers are Japanese and half of them are bots and spammer,but through the account I get about 2000yen/month (about 110yen/tweet) by using a Japanese sponsored tweets. From now I`m going to make friends with English users on Twitter and to use not only Japanese promoted tweets services ,but also American ones. What`s the best American promoted tweets (sponsored tweets) services for me?